Dry pump includes tapered, variable-pitch screw technology
The CXS dry vacuum pumps from Edwards incorporate tapered, variable-pitch screw technology that enables gradual compression along the length of the rotor. As a result, users can control the temperature better than they can with other dry-pump technology.
Unlike other marketed pumps that use screw technology, the CXS pumps do not have a cantilever rotor design, and they do not have an end compression plate. The pumps thus do not compact any material when they cool down and have excellent solids handling. These characteristics help to prevent cold seizures and make it easy to restart with solids still in the pump.
The pump’s rotors are designed to not match each other exactly. When one rotor is damaged, a user thus can replace it without having to replace both. The CXS pump also monitors its own temperature and does not begin processing until it is ready. When the pump is not needed, it runs at a lower speed and power level to save energy. The pump is designed to require an exceptionally low level of energy for operation.